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fix: make getRulesMetaForResults return a plain object in trivial case #16438

merged 1 commit into from Oct 18, 2022


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Prerequisites checklist

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[X] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofix to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

This fixes an edge case where FlatESLint.prototype.getRulesMetaForResults([]) would return an empty Map instead of a plain object.

Tell us about your environment:

Node version: v18.11.0
npm version: v8.19.2
Local ESLint version: v8.25.0 (Currently used)
Global ESLint version: Not found
Operating System: darwin 21.6.0

What parser (default, @babel/eslint-parser, @typescript-eslint/parser, etc.) are you using?


What did you do? Please include the actual source code causing the issue.

const { default: { FlatESLint } } = await import('eslint/use-at-your-own-risk');
const engine = new FlatESLint();
const rulesMeta = engine.getRulesMetaForResults([]);

What did you expect to happen?

getRulesMetaForResults should return an empty plain object when called with an empty array.

What actually happened? Please include the actual, raw output from ESLint.

getRulesMetaForResults returns an empty Map.

What changes did you make? (Give an overview)

Fixed the logic in FlatESLint and updated a unit test.

Is there anything you'd like reviewers to focus on?

@eslint-github-bot eslint-github-bot bot added triage An ESLint team member will look at this issue soon bug ESLint is working incorrectly labels Oct 17, 2022
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@fasttime fasttime marked this pull request as ready for review October 17, 2022 20:10
@mdjermanovic mdjermanovic added core Relates to ESLint's core APIs and features accepted There is consensus among the team that this change meets the criteria for inclusion and removed triage An ESLint team member will look at this issue soon labels Oct 18, 2022
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LGTM, thanks!

@mdjermanovic mdjermanovic merged commit 325ad37 into eslint:main Oct 18, 2022
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crapStone pushed a commit to Calciumdibromid/CaBr2 that referenced this pull request Oct 24, 2022
This PR contains the following updates:

| Package | Type | Update | Change |
| [eslint]( ([source]( | devDependencies | minor | [`8.25.0` -> `8.26.0`]( |


### Release Notes


### [`v8.26.0`](

[Compare Source](eslint/eslint@v8.25.0...v8.26.0)

#### Features

-   [`4715787`](eslint/eslint@4715787) feat: check `Object.create()` in getter-return ([#&#8203;16420](eslint/eslint#16420)) (Yuki Hirasawa)
-   [`28d1902`](eslint/eslint@28d1902) feat: `no-implicit-globals` supports `exported` block comment ([#&#8203;16343](eslint/eslint#16343)) (Sosuke Suzuki)
-   [`e940be7`](eslint/eslint@e940be7) feat: Use ESLINT_USE_FLAT_CONFIG environment variable for flat config ([#&#8203;16356](eslint/eslint#16356)) (Tomer Aberbach)
-   [`dd0c58f`](eslint/eslint@dd0c58f) feat: Swap out Globby for custom globbing solution. ([#&#8203;16369](eslint/eslint#16369)) (Nicholas C. Zakas)

#### Bug Fixes

-   [`df77409`](eslint/eslint@df77409) fix: use `baseConfig` constructor option in FlatESLint ([#&#8203;16432](eslint/eslint#16432)) (Milos Djermanovic)
-   [`33668ee`](eslint/eslint@33668ee) fix: Ensure that glob patterns are matched correctly. ([#&#8203;16449](eslint/eslint#16449)) (Nicholas C. Zakas)
-   [`740b208`](eslint/eslint@740b208) fix: ignore messages without a `ruleId` in `getRulesMetaForResults` ([#&#8203;16409](eslint/eslint#16409)) (Francesco Trotta)
-   [`8f9759e`](eslint/eslint@8f9759e) fix: `--ignore-pattern` in flat config mode should be relative to `cwd` ([#&#8203;16425](eslint/eslint#16425)) (Milos Djermanovic)
-   [`325ad37`](eslint/eslint@325ad37) fix: make `getRulesMetaForResults` return a plain object in trivial case ([#&#8203;16438](eslint/eslint#16438)) (Francesco Trotta)
-   [`a2810bc`](eslint/eslint@a2810bc) fix: Ensure that directories can be unignored. ([#&#8203;16436](eslint/eslint#16436)) (Nicholas C. Zakas)
-   [`35916ad`](eslint/eslint@35916ad) fix: Ensure unignore and reignore work correctly in flat config. ([#&#8203;16422](eslint/eslint#16422)) (Nicholas C. Zakas)

#### Documentation

-   [`651649b`](eslint/eslint@651649b) docs: Core concepts page ([#&#8203;16399](eslint/eslint#16399)) (Ben Perlmutter)
-   [`631cf72`](eslint/eslint@631cf72) docs: note --ignore-path not supported with flat config ([#&#8203;16434](eslint/eslint#16434)) (Andy Edwards)
-   [`1692840`](eslint/eslint@1692840) docs: fix syntax in examples for new config files ([#&#8203;16427](eslint/eslint#16427)) (Milos Djermanovic)
-   [`d336cfc`](eslint/eslint@d336cfc) docs: Document extending plugin with new config ([#&#8203;16394](eslint/eslint#16394)) (Ben Perlmutter)

#### Chores

-   [`e917a9a`](eslint/eslint@e917a9a) ci: add node v19 ([#&#8203;16443](eslint/eslint#16443)) (Koichi ITO)
-   [`4b70b91`](eslint/eslint@4b70b91) chore: Add VS Code issues link ([#&#8203;16423](eslint/eslint#16423)) (Nicholas C. Zakas)
-   [`232d291`](eslint/eslint@232d291) chore: suppress a Node.js deprecation warning ([#&#8203;16398](eslint/eslint#16398)) (Koichi ITO)



### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

 **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.


 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, click this checkbox.


This PR has been generated by [Renovate Bot](

Co-authored-by: cabr2-bot <>
Reviewed-by: Epsilon_02 <>
Co-authored-by: Calciumdibromid Bot <>
Co-committed-by: Calciumdibromid Bot <>
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accepted There is consensus among the team that this change meets the criteria for inclusion bug ESLint is working incorrectly contributor pool core Relates to ESLint's core APIs and features
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